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I never thought of taking the 'stat out. I'll try that next time I go over to the lockup. I'll take a flask of boiling (almost) water, also I'll take my full size 'water' fire extinguisher with me as a stand in for a hose pipe, see if I can reverse flush some of that brown silt out! Watch this space.......

I had a similar episode with one of my cars, an Avenger sorry for swearing. Had to change the thermostat housing and after I changed it, it did the same symptoms. It stopped bubbling up when I took the thermostat out and it holds its water with no pressurising. Run it up hot and driven it, no pressurising. I’ve not checked the old thermostat or put a new one in yet, it’s a low use car, but suspect it was just a stubborn air lock somewhere in the system or faulty thermostat.

The inners are same as MK2 escort std models ( RS are imperial thread same as all mk1s)with metric thread.